Melanie Phillips recently posted an article repeating claims by Dave Gaubatz that he had found uranium enrichment sites in Iraq. Supposedly Bush let these sites be looted by mistake, which is why he is covering it up, although it would vindicate the WMD case for war.
Phillips blogs about it here.
Unqualified Offerings has posts here and here about it, as do a handful of others, including Julian Sanchez and Lawrence Auster.
There are a lot of reasons to doubt this story and to think that Gaubatz is loony (click on the first link to an Unqualified Offerings post and they provide a bunch of links showing this), but on the whole the most notable thing about this claim, in my opinion, is that it isn't really new. Three years ago, Michael Ledeen claimed that he had contacts who had discovered Saddam's WMDs and could confirm that they had been moved to Iran and that the CIA refused to investigate.
So this isn't even a new conspiracy theory.
(To be fair, I have not seen this mentioned much in the mainstream media, nor have I found more than a smattering of commentary on this topic by pro-war pundits, so it would be unfair to assume that this elaborate conspiracy theory represents the beliefs of the majority of pro-warriors).
That is all.